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CC0CogiCAITCChg ' 19C- 110 1 7111 Street Modesto,California 95354 (209)522-4119/Fax#5224227 Work Plan Soil and Groundwater Investigation Del Valle Property, Stockton 3995 S. Hwy 99 Stockton, CA Project No. 1117.2 November 18, 2003 1.0 INTRODUCTION On August 25, 2003 Geological Technics completed a Phase I Environmental site Assessment for Del Valle Property in regards to the subject property. A Recognized Environmental Condition on the site was a Former Underground Storage Tank (UST). The Property had a 7000-gallon UST south of a building labeled "welding shop" in San Joaquin County Environmental Health Department's file. All testing done at the time of the tank removal on March 18, 1987 was non-detect for BTEX, TPH-g, Tetraethyl lead, and Ethylene Dibromide. At the time San Joaquin County Environmental Health Department (EHD) did not require MTBE testing with tank removals. However, no closure was given for the site. According to Doug Wilson and Margaret Lagorio of EHD the reason the site was not signed off was that the detection limits for EDB, Lead & Xylene were exceeded. A note in the file stated that the site was not to be signed off because of this. A discussion with Margaret Lagorio of EHD regarding what needs to be done to achieve closure indicated that the levels were fine for EDB, Lead & Xylene, though the laws have changed and the site needs to be tested for MTBE. The purpose of this investigation is to determine the levels of MTBE in order to obtain closure from EHD. 2.0 PROPOSED INVESTIGATION To investigate the possibility of MTBE in the soil, Geological Technics Inc. proposes the following. 1. Tank location search, site and photo scaling. 2. GeoProbe Drill—2 boreholes. 3. Log Boreholes & collect soil samples. 4. Test two samples from each borehole for MTBE by method 8260